Does the trial court have a duty to declare a mistrial on its own motion?

Furthermore, the trial court had no duty to declare a mistrial on its own motion. Nor could the court take defense counsel's request for an admonition as evidence that appellant would consent to a mistrial. As we shall explain, this is so because once a jury trial has commenced and jeopardy has attached, the court may not declare a mistrial on its own motion unless there is a legal necessity or the defendant consents. (Curry v. Superior Court (1970) 2 Cal.3d 707, 712, 717-718 (Curry).)